石墨<strong>/TiO<sub>2</sub></strong>复合光催化剂的制备和性能

doi:10.11901/1005.3093.2020.388

材料研究学报

2021, Vol. 35

Issue (9): 703-711 DOI: 10.11901/1005.3093.2020.388

研究论文

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石墨/TiO₂复合光催化剂的制备和性能

侯静¹^,², 杨培志¹(

), 郑勤红¹, 杨雯¹, 周启航¹, 李学铭¹

^1.云南师范大学可再生能源材料先进技术与制备教育部重点实验室昆明 650500
^2.攀枝花学院攀枝花 617000

Preparation and Performance of Graphite/TiO₂ Composite Photocatalyst

HOU Jing¹^,², YANG Peizhi¹(

), ZHENG Qinhong¹, YANG Wen¹, ZHOU Qihang¹, LI Xueming¹

^1.Key Laboratory of Renewable Energy Advanced and Manufacturing Technology, Ministry of Education, Yunnan Normal University, Kunming 650500, China
^2.Panzhihua University, Panzhihua 617000, China

引用本文:

侯静, 杨培志, 郑勤红, 杨雯, 周启航, 李学铭. 石墨/TiO₂复合光催化剂的制备和性能[J]. 材料研究学报, 2021, 35(9): 703-711.
Jing HOU, Peizhi YANG, Qinhong ZHENG, Wen YANG, Qihang ZHOU, Xueming LI. Preparation and Performance of Graphite/TiO₂ Composite Photocatalyst[J]. Chinese Journal of Materials Research, 2021, 35(9): 703-711.

全文: PDF(19428 KB) HTML

摘要:

以石墨和纯的TiO₂为原料，采用球磨工艺制备了石墨/TiO₂复合光催化剂。使用XRD、SEM、TEM、XPS和DRS等手段对其性能进行了表征。以甲基橙为模拟污染物，研究了石墨掺入量、球磨时间对复合光催化剂光催化活性的影响。结果表明，石墨/TiO₂复合光催化剂具有锐钛矿结构，球磨后TiO₂(101)面的衍射峰宽化并右移，TiO₂成为200 nm左右的不规则球状颗粒，在其表面均匀分布着石墨。TiO₂晶粒的Ti-O键的结合能变高，且表面有缺陷产生，使其在可见光区具有显著的吸收。石墨掺入量为5%、球磨时间为12 h的石墨/TiO₂样品对甲基橙具有优异的光催化降解效果，在70 min的降解时间内甲基橙的降解去除率可达95.08%。石墨/TiO₂复合光催化剂的光催化反应速率常数k为0.043035 min^-1，是纯TiO₂的2.64倍。

关键词 ：复合材料, 石墨/TiO₂, 甲基橙, 光催化, 球磨

Abstract：

The composite photocatalyst of graphite/TiO₂ was prepared by high-energy ball milling with graphite and pure TiO₂ as the raw materials. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and ultraviolet diffuse reflectance (DRS). The effect of graphite addition and ball milling time on the photocatalytic activity of the prepared composite photocatalyst was investigated by comparison of their degradation efficiencies for the methyl orange as the simulated pollutant. The results show that after ball milling the graphite/TiO₂ composite photocatalyst presents an anatase-like X-ray diffraction pattern, the diffraction peak of TiO₂(101) plane widened and shifted to the right, the TiO₂ particles are irregular spherical around 200 nm, and the graphite uniformly distributed on the TiO₂ surface. Because of higher binding energy of TiO₂ grains, the defects generated on the surface of the graphite doped TiO₂ have significant absorption capacity in the visible light region. The graphite/TiO₂ composite photocatalyst with 5 mass% graphite prepared by ball milling for 12 h showed the best photocatalytic degradation effect of methyl orange. After the degradation time of 70 min the degradation removal rate of methyl orange could reach 95.08%, and the reaction rate constant k was 0.043035 min^-1, which was 2.64 times that of the pure TiO₂.

Key words： composites graphite/TiO₂ methyl orange photocatalysis ball milling

收稿日期: 2020-09-14

ZTFLH:

O643

基金资助:国家自然科学基金(U1802257);云南省基础研究重点项目(2017FA024);云南省高校科技创新团队支持计划，攀枝花大学科技园种子资金

作者简介: 侯静，男，1987年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.388 或 https://www.cjmr.org/CN/Y2021/V35/I9/703

图1 石墨掺入量不同的石墨/TiO2复合光催化剂的 XRD谱

图2 球磨时间不同的5%石墨/TiO2复合光催化剂的XRD谱

图3 球磨时间不同的石墨/TiO2复合光催化剂SEM照片

图4 石墨掺入量不同的石墨/TiO2复合光催化剂SEM照片

图5 5%石墨/TiO2复合光催化剂的EDS分析与元素分布

图6 5%石墨/TiO2复合光催化剂的TEM照片和HRTEM谱

图7 5%石墨/TiO2复合光催化剂的XPS谱

图8 石墨/TiO2复合光催化剂的UV-Vis吸收光谱

图9 石墨掺入量不同的石墨/TiO2复合光催化剂对甲基橙的吸附/光催化降解性能

图10 不同球磨时间的石墨/TiO2复合光催化剂对甲基橙的吸附/光催化降解性能

图11 石墨/TiO2复合光催化剂的光催化反应机理

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